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Women in an area of Santa Ana known for prostitution say they recognize a man accused of raping and killing prostitutes in Orange County. Gadi Schwartz reports from Santa Ana for the NBC4 News at 11 on Monday, April 14, 2014. (Published Tuesday, Apr 15, 2014)

Updated at 12:29 PM PST on Tuesday, Apr 15, 2014

Two parolees raped and killed at least four women in Orange County last year while wearing GPS ankle bracelets, police said Monday.

Ex-Cons Suspected of Being Serial Killers

Following a news conference out of Orange County, two ex-convicts are now suspected of being serial killers. They are accused of raping and killing four women since last year. Vikki Vargas reports from the Anaheim Police Department for the NBC4 News at 5 p.m. on Monday, April 14, 2014. (Published Monday, Apr 14, 2014)

Franc Cano and Steven Dean Gordon, both registered sex offenders, wore the tracking devices and checked in with police every 30 days during the murders last October and November, Anaheim police Chief Raul Quezada said at an afternoon press conference.

The two men were each charged Monday with four felony counts of special circumstances murder and four felony counts of rape, Orange County District Attorney Tony Rackauckas said.

Investigators got a break in the case when a woman's body was discovered on a conveyor belt at an Anaheim recycling plant on March 14. She was later identified as 21-year-old Jarrae Nykkole Estepp of Oklahoma.

The three other women had been reported missing from Santa Ana. They were identified as 20-year-old Kianna Jackson of Las Vegas, and Santa Ana residents Josephine Vargas, 34, and Martha Anaya, 28. Investigators were searching for their bodies.

"Our hearts go out to the victims in this case," Rackauckas said. "Certainly, the families are all very distraught and concerned."

Herlinda Salcedo said police came to her home Saturday to inform her that her daughter Anaya, who disappeared in November 2013, was dead. Police also told her they had not found Anaya’s body.

Salcedo spent months searching for her daughter. The mother told NBC4 she has found closure.

A woman in an area of Santa Ana known for prostitution told NBC4’s Gadi Schwartz that she recognized Gordon, and that he was known to offer women rides in an RV where they could get high on crack cocaine.

“He was always offering rides,” said the woman, who did not want to be identified. “In a safe place, that’s priceless for some of these girls out here.”

Police are in possession of the RV. Arraignment on Tuesday was postponed to May 19.